Meaning of 胸反 in Japanese

It seems that your search contains the following:

Definition of 胸反

むね(mune) · むな(muna) 【胸】

たん(tan) 【反 ·段 ·端】

(n, n-pref) variable measure of fabric (28.8 cm in width); for kimonos: at least 10 m in length; for haori: at least 7.27 m in length; for other clothes: at least 6.06 m in length
彼は階段を一度に三段ずつかけあがった。
He jumped up the steps three at a time.
300 tsubo (991.74 meters square, 0.24506 acres)
six ken (10.91 m)

はん(han) 【反】

(n, vs, n-pref) anti-; opposite; antithesis; antagonism
それは反道徳的だ。
It is still immoral.